松辽盆地下白垩统营城组火山岩喷发旋回特征
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摘要
松辽盆地兴城地区下白垩统营城组一段火山岩可划分为下部、中部和上部3个喷发旋回。营城组一段98%的工业气流都富集在上部旋回,该旋回便成为火山岩勘探开发的重点,而快速准确地确定上部旋回、明确各旋回的井—震标志则成为首要任务。基于关键井钻井资料及其地震反射特征的对比分析,建立了火山岩喷发旋回的井—震标志:①下部旋回的岩性以酸性岩为主,含中基性岩,喷溢相占90%;部分井段伽马值小于90API;地震特征为席状—盾状—锥状、中—强振幅、中高频、连续性好。②中部旋回的岩性以酸性岩为主,发育少量的中性岩,喷溢相占79.5%;伽马值多为90～160API;地震特征为丘状—透镜状—穹隆状—板状、中弱振幅、中低频、连续性中—好。③上部旋回的岩性为酸性岩,喷溢相占47.1%、爆发相比例大幅度提高;伽玛值多为130～260API;地震特征为丘状—楔状—席状、中弱振幅、中低频、连续好—差。上述火山岩喷发旋回的井—震标志也为快速找准邻区火山岩勘探目的层提供了依据。
The volcanic rocks in the first member of the Yingcheng Formation in Xingcheng area, Songliao Basin, can be divided into three eruption cycles, including lower, middle and upper cycles. In the first member of the Yingcheng Formation, 98% of the industrial gas flow is obtained in the upper cycle. Therefore, the upper cycle is the primary target of volcanic reservoir exploration and development, and the primary task is to define the well-seismic correlation marks of each cycle. ①The lower cycle is dominated by acidic rocks and contains some intermediate and basic rocks. Effusive facies occupies 90%. The GR value of some intervals is less than 90API. The seismic reflections are in sheet-shield-cone shape and feature in medium-high amplitude, medium-high frequency and good continuity. ②The middle cycle is dominated by acidic rocks and contain minor intermediate rocks. Effusive facies occupies 79.5%. The GR values are mostly in the range of 90 - 160API. The seismic reflections are in mound, lenticular, dome or slab shapes and feature in medium-low amplitude, medium-low frequency and fair-good continuity. ③The upper cycle is completely acidic rocks. Effusive facies occupies 47.1%, while the percentage of eruptive facies increases remarkably. Most of the GR values are in the range of 130 - 260API. The seismic reflections are in mound, wedge or sheet shapes, featured by medium-low amplitude, medium-low frequency, good-poor continuity. The well-seismic correlation marks of the volcanic eruptive cycles also provide bases for rapidly identifying exploration targets of volcanic rocks in the adjacent blocks.
The volcanic rocks in the first member of the Yingcheng Formation in Xingcheng area, Songliao Basin, can be divided into three eruption cycles, including lower, middle and upper cycles. In the first member of the Yingcheng Formation, 98% of the industrial gas flow is obtained in the upper cycle. Therefore, the upper cycle is the primary target of volcanic reservoir exploration and development, and the primary task is to define the well-seismic correlation marks of each cycle. ①The lower cycle is dominated by acidic rocks and contains some intermediate and basic rocks. Effusive facies occupies 90%. The GR value of some intervals is less than 90API. The seismic reflections are in sheet-shield-cone shape and feature in medium-high amplitude, medium-high frequency and good continuity. ②The middle cycle is dominated by acidic rocks and contain minor intermediate rocks. Effusive facies occupies 79.5%. The GR values are mostly in the range of 90 - 160API. The seismic reflections are in mound, lenticular, dome or slab shapes and feature in medium-low amplitude, medium-low frequency and fair-good continuity. ③The upper cycle is completely acidic rocks. Effusive facies occupies 47.1%, while the percentage of eruptive facies increases remarkably. Most of the GR values are in the range of 130 - 260API. The seismic reflections are in mound, wedge or sheet shapes, featured by medium-low amplitude, medium-low frequency, good-poor continuity. The well-seismic correlation marks of the volcanic eruptive cycles also provide bases for rapidly identifying exploration targets of volcanic rocks in the adjacent blocks.
引文
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[9]冯志强,王玉华,雷茂盛,等.松辽盆地深层火山岩气藏勘探技术与进展[J].天然气工业,2007,27(8):9-12.
[10]DAVY B W,CALDWELL T G.Gravity,magnetic and seismic surveys of the caldera complex,Lake Taupo,North Island,New Zealand[J].Journal of Volcanology and Geothermal Research,1998,81:69-89.
[11]NAPPI G,ANTONELLI F,COLTORTI M.Volcanolog-ical and petrological evolution of the Eastern Vulsini Dis-trict,Central Italy[J].Journal of Volcanology and Geo-thermal Research,1998,87:211-232.
[12]谢家莹.试论陆相火山岩区火山地层单位与划分———关于火山岩区填图单元划分的讨论[J].火山地质与矿产,1996,17(3/4):85-94.
[13]张立东,郭胜哲,张长捷,等.北票—义县地区义县组火山构造及其与化石沉积层的关系[J].地球学报,2004,25(6):639-646.
[14]白志达,徐德斌,张秉良,等.龙岗火山群第四纪爆破火山作用类型与期次研究[J].岩石学报,2006,22(6):1473-1480.
[2]WANG PU-JUN,REN YAN-GUANG,SHAN XUAN-LING,et al.The Cretaceous volcanic succession around the Songliao Basin,NE China:Relationship between volcanism and sedi mentation[J].Geological Journal,2002,37(2):97-115.
[3]宋吉杰.松辽盆地北部兴城地区火山岩地震预测[J].石油地球物理勘探,2007,42(3):315-317.
[4]侯启军.大庆探区油气勘探新进展与下步勘探方向[J].中国石油勘探,2004,9(4):1-5.
[5]唐华风,王璞?,姜传金,等.松辽盆地火山岩相地震特征及其与控陷断裂的关系[J].吉林大学学报:地球科学版,2007,37(1):73-78.
[6]舒萍,丁日新,曲延明,等.徐深气田火山岩储层岩性岩相模式[J].天然气工业,2007,27(8):23-27.
[7]冯志强.松辽盆地庆深大型气田的勘探前景[J].天然气工业,2006,26(6):1-5.
[8]徐正顺,王渝明,庞彦明,等.大庆徐深气田火山岩气藏储集层识别与评价[J].石油勘探与开发,2006,33(5):521-531.
[9]冯志强,王玉华,雷茂盛,等.松辽盆地深层火山岩气藏勘探技术与进展[J].天然气工业,2007,27(8):9-12.
[10]DAVY B W,CALDWELL T G.Gravity,magnetic and seismic surveys of the caldera complex,Lake Taupo,North Island,New Zealand[J].Journal of Volcanology and Geothermal Research,1998,81:69-89.
[11]NAPPI G,ANTONELLI F,COLTORTI M.Volcanolog-ical and petrological evolution of the Eastern Vulsini Dis-trict,Central Italy[J].Journal of Volcanology and Geo-thermal Research,1998,87:211-232.
[12]谢家莹.试论陆相火山岩区火山地层单位与划分———关于火山岩区填图单元划分的讨论[J].火山地质与矿产,1996,17(3/4):85-94.
[13]张立东,郭胜哲,张长捷,等.北票—义县地区义县组火山构造及其与化石沉积层的关系[J].地球学报,2004,25(6):639-646.
[14]白志达,徐德斌,张秉良,等.龙岗火山群第四纪爆破火山作用类型与期次研究[J].岩石学报,2006,22(6):1473-1480.
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